The monotonic decline in turnout in presidential elections since 1960 is the subject of this analysis of survey data. After some common explanations for this decline were rejected, it was discovered that the decline occurred mainly among low-income and low-education whites. Two explanatory hypotheses were examined, but appropriate data for testing themwere unavailable; however, in the 1970s nonvoters were more likely than voters at all income levels to express dissatisfaction with the political system. Nonvoting whites are not always a Democratic group, and their voting behavior is unpredictable over time. Their failure to vote may have an especially significant impact on Democratic party policies, and implies that palliatives like reform of voter registration laws may not have the desired effect.